i flew from California to DC and then drove around VA, DC, all the way to OH with my 3 month old. Tips for aircraft - nurse on demand - The younger they are the easier it is. Get a sling/baby backpack type thing and use it to keep the baby close to you (plus you get your arms free (the baby can not be in it for take off or landing, so just hold him/her during that time (maybe even nurse so he/she doesnt get ear pain).
If you formula feed/supplement - know that you CAN bring formula through the airport (even bottles of water to make powdered formula so long as they are unopened) (it is exempt).
I wouldnt worry too much about a sleep schedule while traveling, your baby will adjust. Your baby is too young to force the issue while traveling...Just try to maintain the schedule at home as best as possible (i.e. if baby naps at 10am at home, the baby should nap at 10am in the new time zone (dont adjust for time differences).
When our hotel did not provide a crib, we turned the recliner style chair into a crib by pushing it up against our bed (so the baby could not roll out on any side (3 sides of the chair and one against the bed), we put blankets etc. down and made it a "bed"... or if you take a stroller that will lie flat, use it as a bed.
Good luck and have fun in Europe!